This paper describes an experiment that studies perceived video quality, with the goal to get a better understanding of
whether a temporal or a spatial MPEG-2 based adaptation method should be used for video transmission over variable
bandwidth. The research focused on the relation between in-scene motion and camera motion on spatial as well as
temporal distortions in video sequences. Participants were tested on their sensitivity and appreciation for spatial and
temporal distortions using the scale paradigm of direct comparison. Footage was shot to create video material of three
scenes with a systematic manipulation of in-scene motion and camera motion, which produced twelve different video
sequences. Results show a relation trend between the two types of motion and the two types of distortion in video
sequences. The main result indicates that participants generally rated spatial distortions as better video quality than the
same video sequence containing temporal distortions; even though video sequences containing spatial distortions were
coded at an overall lower bitrate than video sequences containing temporal distortions.
KEYWORDS: Video, Signal to noise ratio, Cameras, Video processing, Video coding, Video compression, Image quality, Quantization, Plasma display panels, Plasma
To interpret the impressions of observers, it is necessary to understand the relationship between components that
influence perceived video quality. This paper addresses the effect of assessment methodology on the subjective
judgement for spatial and temporal impaired video material, caused by video adaptation methods that come into play
when there is variable throughput of video material (I-Frame Delay and Signal-to-Noise Ratio scalability). Judgement
strategies used are the double-stimulus continuous-quality scale (DSCQS) and the double stimulus impairment scale
(DSIS). Results show no evidence for an influence of spatial artifacts on perceived video quality with the presented
judgement strategies. Results for the influence of temporal artifacts are less easy to interpret, because it is not possible to
distinguish whether the non-linear relation between DSIS and DSCQS appeared because of the temporal artifacts
themselves or presented scene content.
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